According to Arlington County Police, the crime happened on January 13 in the early morning hours. The victim, a 37-year-old patient, went down to the emergency room and reportedly told personnel that she had been sexually assaulted.

Police have identified the suspect as 30-year-old Roy Anthony Jones of D.C. He is charged with one count of rape, and authorities tell ABC7 that the victim was in fact his patient -- he was the CAT Scan operator.

Visitors here are shocked to learn the news:

"I can't imagine," said Fairfax resident Scarlet Tamashiro. "The hospital is the last place I think something like that can happen."

"You have faith in these people, and you go thinking you're safe," added Loretta Keith of Kansas City.

Police aren’t releasing specific details about where the attack took place, but confirm that Special Victims Unit detectives arrested Jones after questioning on Monday morning.

"We collected an extensive amount of forensic evidence. It took some time for the division of consolidated laboratory to do the analysis," said Dep. Chief Daniel Murray with Arlington County Police.

The notion of a sex assault on a patient, allegedly by a hospital worker, has many people angry and concerned.

"If she's under any medication, it makes the situation worse…A hospital is a place we come for care, they have to do something better for our security," said Arlington resident Lily Mata.